Final answer:
The 'burger king foot lettuce' incident, which was solved by 4chan, involved an image of an employee standing in lettuce and led to the employee's dismissal.
Step-by-step explanation:
The list of mysteries solved by 4chan includes various incidents that were investigated or revealed by users on the 4chan internet forum. The case referred to as "burger king foot lettuce" involved a photo that was shared online showing a Burger King employee standing in two tubs of lettuce with his shoes on.
This event became widely discussed on 4chan and other social media platforms, leading to the identification and subsequent firing of the employee responsible for the incident. It serves as an example of how internet communities such as 4chan can influence real-world outcomes.